Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

Norhisam Misron,Hanamoto Tsuyoshi,Ishak Aris,Chockalingam Aravind Vaithilingam,Luqman Mohd Saini

doi:10.3390/app10238581

Norhisam Misron, Hanamoto Tsuyoshi + Show 3 more

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https://doi.org/10.3390/app10238581

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Abstract

Magnetic gears (MGs) technology is studied widely among research institutions, with several improvements being documented. This development attracts a high amount of attention due to the demand in the development of magnetic gears towards higher performance than the conventional mechanical counterpart. In general, the design is complicated and there is a lack in detailed references for designing an MG for specific transmission torque as required by its application. Trial-and-error approaches have been the norm in achieving the desired torque by referring the existing MGs for the desired value of torque. This paper presents a new simplified approach towards designing an MG for the required torque and size by referring through a Maximum Transmission Torque Line (MTTL) reference. Finite element method (FEM) is used in analyzing randomly designed magnetic gears with various parameters towards the desired values of the MTTL. The proposed approach of MTTL is a new approach to estimate the total volume of permanent magnets (PMs) required for the MG to achieve the desired transmission torque. The reference line is used to generate equation relating the specific parameters of MG to develop the simplified design of MG based on the estimated total volume of PMs. This simplified way details to 8.5% of error in targeting the desired transmission torque, a means and way for the first stage of the MG design approach to reduce the conventional approaches.

Highlights

Since 1901, magnetic gears (MGs) have been developed as an alternative to the mechanical gear with the use of permanent magnetic force
The transmission torque and size of the MG have to be decided by a designer based on the requirement of their application, where the size is consist of the decided by a designer based on the requirement of their application, where the size is consist of the outer radius, r, and the axial length of the MG, `
The performance of an MG depends on the total volume of permanent magnets (PMs) used and the magnetic flux flowing through the structure of the MG

Summary

Introduction

Since 1901, magnetic gears (MGs) have been developed as an alternative to the mechanical gear with the use of permanent magnetic force. Magnetic gears make a contactless speed conversion with a very efficient torque transmission performance, inherent to overload, reduced audible noise, and lubrication-less systems [1,2]. The transmission torque is an important output to meet the demand of its application, especially from the conversion of high-speed input to low-speed output. Various magnetic gears have been developed in different configurations and concepts. The motivation lies with the impact of the magnetic gear technology with the capability to enter the industries sector. A magnetic gear system with bigger torque capacity with

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